What is idiopathic urticaria?

Updated: Mar 21, 2018
  • Author: Henry K Wong, MD, PhD; Chief Editor: Michael A Kaliner, MD  more...
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For some cases of urticaria, especially chronic urticaria, no cause can be found, despite exhaustive efforts. This is known as idiopathic urticaria, [2] although most of these are chronic autoimmune urticaria as defined by a positive autologous serum skin test (ASST). [9]

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